What’s New in K8s 1files.meetup.com/18569714/What's New in K8s 1.3.pdf · Automated Rollbacks...

What’s New in K8s 1.3

Carter Morgan@_askcarter

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Background: 3 Hurdles

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The AppHow do I write scalable apps?

How do I package and distribute?

What runtimes am I locked into?

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The InfraCan I scale?

Is it automatic?

Am I locked in?

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The Wild Where are my machines?

How do I update?

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Kubernetes

Open Source Container Automation Framework

• Open API

• Based on Google’s experiences

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3 Claims

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How does k8s hold up?

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Kubernetes Pre 1.3

Horizontal ScalingAutomated RollbacksContainer SchedulingResource Quotas and LimitsSelf-healingService Discovery and Load BalancingSecret and Configuration ManagementDaemon SetsSecrets and Config MapsDeployments

(already had a lot)

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monolith

nginx

hello

nginx

Microservices

Monolith

auth

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Container BasedPhoto © ptnimages via Canva.com

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PodsLogical Application• One or more containers

and volumes• Shared namespaces• One IP per pod Pod

nginx

monolith

NFSiSCSIGCE

10.1.0.100

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LabelsArbitrary metadata attached to any API object• Queryable by Selectors• How Kubernetes does

groupingPod

nginx

monolith

Pod

nginx

monolith

labels: version: v1 track: stable

labels: version: v1 track: test

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Labels

selector: version=v1Pod

nginx

monolith

Pod

nginx

monolith



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Labels

selector: track=stablePod

nginx

monolith

Pod

nginx

monolith



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ServicesPersistent IPs for Pods• Uses Labels to

Target Pods• Internal or External IPs

Pod

nginx

monolith

Pod

nginx

monolith

Service10.8.244.100

10.1.0.210.1.0.1

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DeploymentsDrive current state towards desired state

Node 1

Pod

app: hello replicas: 1

hello

Node 2

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Node 1

Pod


hello

Node 2

Podhello

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Node 1

Pod


hello

Node 2

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Node 1

Pod


hello

Node 2

Podhello

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Rolling Update

Node 1

Podhello

Podhello

Node

Podhello

Node

Podhello

Node

Podhello

Service

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Rolling Update

Node 1

Podhello

Podhello

Node

Podhello

Node

Podhello

Node

Podhello

Service

Podgoodbye

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Rolling Update

Node 1

Podhello

Podhello

Node

Podhello

NodeNode

Podhello

Service

Podgoodbye

Podgoodbye

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Rolling Update

Node 1

Podhello

Podhello

Node

Podhello

NodeNode

Service

Podgoodbye

Podgoodbye

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Rolling Update

Node 1

Podhello

Podhello

Node

Podhello

NodeNode

Service

Podgoodbye

Podgoodbye

Podgoodbye

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Rolling Update

Node 1

Podhello

Podhello

Node NodeNode

Service

Podgoodbye

Podgoodbye

Podgoodbye

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3 Claims: revisited

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Kubernetes 1.3

Init containers (alpha)Fixed PDsCluster Federation (alpha)Optional HTTP2Pod Level QoS PolicyTls secretskubectl set commandUIJobsRBAC (alpha, experimental)Garbage Collector (alpha)Pet Setsrkt Container runtimeNetwork policies(and more)

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Cluster Federation

Manage clusters across region and providers

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JobsPods *expected* to terminate

Creates 1...n Pods and ensures that a certain number of them run to completion

3 types: non-parallel, fixed count parallel, and parallel with a work queue

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Job: Work Queue with Pod Per Work Item

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Init ContainersSequential Pod Initialization

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Pod

Init 1

monolith

NFS

10.1.0.100

Init 2 Init 3

Init Container: register pod to external service

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Init Container: clone a git repo into a volume

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Pet SetsPods with ego

Pods are fungible, stateless?

Pets are Pods with:

1. Stable hostname2. A unique name3. Stable storage

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PetSet: example manifest

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PetSet: headless service

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Bonus

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Google Container

Engine(GKE)

Cluster autoscaling (beta)IAM supportLocal SSDContainer-VM Images (beta)Node pools

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minikube github.com/kubernetes/minikube

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Kube UIkubernetes.io/docs/user-guide/ui/

(demo)

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Thing I learned(making this talk)

kubectl explain deployment.spec.minReadySeconds

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Recap

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3 HurdlesThe App

The Infra

The Wild

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3 ClaimsPlanet Scale

Never Outgrow

Run Anywhere

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Kubernetes 1.3Planet Scale -

Never Outgrow - minikube to prod

Run Anywhere - Cluster Federation

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Scalable Microservice

with Kubernetes

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http://www.youtube.com/watch?v=T59RtLov9E0

Carter Morgan@_askcarter

Watch blog.kubernetes.io for the big release!

@_askcarter

What’s New in K8s 1files.meetup.com/18569714/What's New in K8s 1.3.pdf · Automated Rollbacks...

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